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The invention relates to a color wheel, which comprises a multicolor optical filter group, a motor, a supporting piece, a sensor and a processor, wherein the supporting piece comprises a first surface, a second surface which is opposite to the first surface, and a sidewall which is positioned between the first surface and the second surface; the multicolor optical filter group is fixed on the second surface of the fixed piece; the motor is used for driving the fixed piece to rotate, so as to drive the multicolor optical filter group to rotate; the sensor is provided with a shell and a sensor wafer which is used for sensing the position of the multicolor optical filter group and transmitting the position state of the current multicolor optical filter group to the processor; and the processor controls color composition processing according to the position state of the multicolor optical filter group. The color wheel also comprises a light-retaining component which is arranged on the sensor shell and used for preventing stray light from being emitted to the sensor wafer. The color wheel can prevent the stray light from interfering the sensor, and can improve the problem of timing synchronization between the processor and optical filters, thereby optimizing the representation effect of colors.